We stayed overnight on the 13th so we got these benefits. Be sure to ask at check in as they may forget to give you the coupon book.
Discounted Park Hopper® Ticket (as many as five days of park hopping at a special rate of $119 for each adult or $99 for each child ages 3-9)--This is a length of stay ticket, so it depends on how long you are there. It didn't work for us because we were only there one night.
Free "50th anniversary" dessert plate with a purchase at participating restaurants (the sit down more expensive ones)--we got one of these on the 14th with our meal at the Blue Bayou. There are 6 limited designs, and they are shown on the coupon. One of them has the castle on it, so we asked our server if we could get that one and we did. It came packaged nicely in a box and traveled home well.
10 percent discount off purchases of $50 or more at participating merchandise shops.
Preferred access to the ASIMO show inside the Innoventions attraction at
Disneyland Park--it wasn't crowded, so this coupon didn't really serve a purpose.
Preferred access to the Turtle Talk with Crush show (inspired by Walt Disney Pictures' presentation of the Pixar Animation Studios film Finding Nemo) at Disney's California Adventure™ Park--they let us in before everyone else, however there really aren't bad seats here.
There was also a coupon for a discount at Build-a-Bear and at Illuminations at Downtown Disney.